CN113135398A - Garbage pyrolysis feeding mechanism's coordinated control system - Google Patents

Abstract

The invention belongs to the technical field of control methods for automatic feeding of household garbage in a household garbage pyrolysis process, and particularly relates to a linkage control system of a garbage pyrolysis feeding mechanism. The programmable logic controller is connected with the human-computer interaction interface and respectively controls the material distribution motor, the conveying belt, the belt scale, the gate valve A, the gate valve B, the reciprocating electric push rod, the vertical screw A, the conveying screw, the vertical screw B and the pyrolysis reactor. The garbage after being crushed and dried is automatically and continuously conveyed to the pyrolysis reactor through the garbage distribution bin, the garbage feeding amount is continuous, uniform and adjustable, and the garbage distribution bin has better adjustability and safety.

Description

Garbage pyrolysis feeding mechanism's coordinated control system

Technical Field

The invention belongs to the technical field of control methods for automatic feeding of household garbage in a household garbage pyrolysis process, and particularly relates to a linkage control system of a garbage pyrolysis feeding mechanism.

Background

The garbage pyrolysis process is an advanced garbage treatment process and realizes garbage pyrolysis in a high-temperature anaerobic mode. The garbage pyrolysis process ensures the harmless treatment of the garbage (no dioxin generation), saves energy, reduces consumption, improves the garbage heat treatment efficiency, reduces the human resource cost and strength as much as possible and improves the working efficiency. The automatic feeding of the garbage in the garbage pyrolysis process requires that the garbage feeding is continuous, uniform and adjustable, the sealing requirement of the garbage is met, and the anaerobic environment of the pyrolysis reactor is achieved.

The existing domestic garbage treatment process mainly adopts garbage incineration, and the form of the domestic garbage treatment process is divided into a mechanical grate, a circulating fluidized bed and a rotary kiln. The mechanical grate garbage feeding is generally composed of a garbage storage pit, a garbage grab bucket, a garbage feeding hopper, a switch stop gate, a feeding chute and a material pusher. The main adjustment is realized by adjusting the pushing speed of the pusher. For the garbage pyrolysis process, the mechanical grate garbage feeding mode can not only realize the sealing of the garbage feeding, but also ensure the continuity and uniformity of the garbage feeding, so the feeding requirement of the garbage pyrolysis process can not be met; the garbage feeding mode of the circulating fluidized bed is that pretreated garbage is conveyed to an incinerator through a shaftless double-helix feeding device, and although continuous feeding of the garbage is realized, the inside of the device is loosely filled during shaftless double-helix feeding, so that a sealed oxygen insulation effect cannot be effectively realized; the feeding device for waste incineration of the rotary kiln is provided with a feeding screw, a pushing scraper or a belt feeding machine in the prior art, the feeding screw and the belt feeding machine cannot realize effective sealing, and the feeding scraper cannot realize continuous, uniform and adjustable waste feeding.

In summary, the garbage pyrolysis process is a process of anaerobic heating pyrolysis of garbage, and in order to ensure that the garbage enters the reactor for continuous, stable and safe pyrolysis, it is necessary to improve the technology of the garbage feeding mechanism to realize continuous, stable and safe full-automatic feeding of the garbage.

Disclosure of Invention

The invention aims to provide a linkage control system of a garbage pyrolysis feeding mechanism, which is used for automatically and continuously conveying crushed and dried garbage (with the particle size range of 50-100 mm) to a pyrolysis reactor from a garbage distribution bin, and has the advantages of continuous, uniform and adjustable garbage feeding amount, and better adjustability and safety.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a linkage control system of a garbage pyrolysis feeding mechanism is characterized in that a programmable logic controller is connected with a human-computer interaction interface, and the programmable logic controller respectively controls a material distribution motor, a conveying belt, a belt scale, a gate valve A, a gate valve B, a reciprocating electric push rod, a vertical screw A, a conveying screw, a vertical screw B and a pyrolysis reactor.

The human-computer interaction interface adopts an upper computer and communicates with the programmable logic controller through a network protocol to realize data exchange, and the human-computer interaction interface can display parameters of the feeding system in real time and also can control equipment of the feeding system in real time.

The programmable logic controller realizes acquisition of data of a frequency converter and electric drive in the feeding system and can also control the feeding system to operate through output signals; the pyrolysis reactor is driven by a frequency converter, realizes the start-stop/rotating speed control function with a programmable logic controller, and receives the operation/fault/rotating speed feedback/current signal from the frequency converter.

The cloth motor is driven by the frequency converter, realizes a remote start-stop/rotating speed control function with the programmable logic controller, and receives the running/fault/rotating speed feedback/current signal of the frequency converter; the conveying belt is driven by the frequency converter, realizes a remote start-stop/rotating speed control function with the programmable logic controller, and receives the running/fault/rotating speed feedback/current signal of the frequency converter.

The belt weigher is driven by the belt weigher electrical cabinet, realizes a remote start-stop control function with a programmed logic controller, and receives an electrically driven operation/fault/real-time weighing signal.

The gate valve A and the gate valve B are electrically and directly driven to realize a remote start-stop/steering switching control function with a programmable logic controller, and receive an electrically driven operation/fault/switch-in-place/current signal.

The reciprocating electric push rod is driven by the frequency converter, realizes the functions of starting, stopping, steering switching and rotating speed control with the programmable logic controller, realizes the automatic reciprocating motion of the reciprocating electric push rod through programming, and receives the running/fault/switch-in-place/rotating speed feedback/current signals of the frequency converter.

The vertical spiral A and a programmable logic controller realize the start-stop function through the electric direct start drive and receive the operation/fault/current signals from the electric direct start drive; the conveying screw is driven by a frequency converter, realizes a start-stop/rotating speed control function with a programmable logic controller, and receives an operation/fault/rotating speed feedback/current signal from the frequency converter; the vertical spiral B realizes the start-stop function with the programmable logic controller through the electric direct start drive and receives the operation/fault/current signal from the direct start drive.

The control method at the time of failure is as follows:

1) the man-machine interaction interface carries out sound and information fault alarm prompt;

2) simultaneously stopping the automatic feeding program;

3) meanwhile, a stop command is sent out through a programmable logic controller, and the material distribution mechanism, the conveying belt, the belt scale, the reciprocating electric push rod, the vertical screw A, the conveying screw and the vertical screw B are stopped;

4) simultaneously, stopping a motor of the gate valve A after the gate valve A is closed;

5) and simultaneously stopping the motor of the gate valve B after closing the gate valve B.

The normal work control method comprises the following steps:

1) starting the vertical spiral B, judging whether the work is normal, continuing the next step after the work is normal, and checking a fault and restarting the vertical spiral B if the work is not normal;

2) starting the conveying screw, judging whether the conveying screw works normally, continuing the next step after the conveying screw operates normally, and checking a fault and restarting the conveying screw if the conveying screw does not work normally;

3) starting the vertical spiral A, judging whether the work is normal, continuing the next step after the work is normal, and checking a fault and restarting the vertical spiral A if the work is not normal;

4) starting the reciprocating type electric push rod to automatically operate in a reciprocating manner, judging whether the work is normal or not, continuing the next step after the work is normal, and checking a fault and restarting if the work is not normal;

5) judging whether the reciprocating motion of the vertical screw A, the vertical screw B, the conveying screw and the reciprocating electric push rod works normally or not, continuing the next step after the reciprocating electric push rod works normally, and checking a fault and restarting if the reciprocating electric push rod does not work normally;

6) starting an automatic feeding program, closing the gate valve B, and carrying out the next step after the gate valve B is closed in place for delay of 5 s;

7) starting an automatic feeding program, opening a gate valve A, and carrying out the next step after the gate valve A is opened to a position for delay of 5 s;

8) starting an automatic feeding program, simultaneously starting a material distribution motor, a conveying belt and a belt scale, stopping the material distribution motor, the conveying belt and the belt scale after three devices run for 30s, and performing the next step after the three devices stop and delay for 5 s;

9) starting an automatic feeding program, closing the gate valve A, and carrying out the next step after the gate valve A is closed in place for 5 seconds;

10) starting an automatic feeding program, opening a gate valve B, and carrying out the next step after the gate valve B is opened to a position for delay of 5 s;

11) starting an automatic feeding program, and returning to the step 6) to circularly execute the automatic feeding program after the feeding starts to time for 90 s;

12) the reciprocating type electric push rod pushes and extrudes the garbage to the tail end of the push rod, one path of low-pressure nitrogen continuously enters the tail end of the reciprocating type electric push rod, and the garbage extrusion and the low-pressure nitrogen blowing realize the isolation and sealing in the garbage conveying process.

The beneficial effects obtained by the invention are as follows:

the invention aims to automatically and continuously convey crushed and dried garbage (with the particle size range of 50-100 mm) from a garbage distribution bin to a pyrolysis reactor, and mainly comprises a programmable logic controller, a man-machine interaction interface, a distribution motor frequency converter, a conveying belt frequency converter, a belt scale, a gate valve A/B, a reciprocating electric push rod frequency converter, a vertical spiral A/B, a conveying spiral frequency converter and a pyrolysis reactor frequency converter, wherein the garbage is conveyed from the distribution motor to the pyrolysis reactor according to logic control.

The frequency and time of a distributing motor frequency converter of the feeding mechanism, the frequency and conveying time of a conveying belt frequency converter, the switching action and time of a gate valve A/B and the frequency of a reciprocating electric push rod frequency converter are controlled and adjusted by a program, and the frequencies of conveying spiral frequency converters are matched with each other, so that the feeding dynamic balance of the garbage feeding continuous conveying and the stepless speed regulation of the conveying amount are realized; the reciprocating type electric push rod pushes and extrudes the garbage to the tail end of the push rod, one path of low-pressure nitrogen continuously enters the tail end of the reciprocating type electric push rod, and the garbage extrusion and the low-pressure nitrogen blowing realize the isolation and sealing in the garbage conveying process. Automatic control through above-mentioned feeding had both realized that the automatic continuous even adjustable of rubbish feeding volume has better regulation nature, realized the sealed of rubbish feeding again, made the effectual isolated seal of rubbish feed mechanism and external environment, had better security.

Drawings

FIG. 1 is a schematic diagram of a refuse feeding system;

FIG. 2 is a block diagram of the system of the present invention;

fig. 3 is a flowchart of the control method.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

The garbage after being crushed and dried is stored in a ground material distribution bin, is conveyed to a belt weigher through a conveying belt and is weighed in real time, then is conveyed to a vertical material discharging barrel, enters a reciprocating type electric push rod through a double-gate valve and is conveyed to a vertical screw A, and then is conveyed to a reactor through a conveying screw and a vertical screw B.

Wherein the cloth machine motor, the conveying belt motor, the electric push rod motor, the vertical spiral A motor, the conveying spiral motor and the vertical spiral B motor are variable frequency motors, and the rotating speed can be adjusted in real time.

The programmable logic controller is internally provided with a programmed control logic and a safety protection program, and controls the electric direct start drive/frequency converter to drive the field equipment through signal input and output, thereby realizing the linkage control of the garbage feeding system.

As shown in fig. 1, the garbage feeding system is configured: the device comprises a material distribution mechanism 1, a conveying belt 2, a belt weighing mechanism 3, a blanking barrel 4, a gate valve A5, a gate valve B6, an electric push rod 7, a vertical screw A8, a conveying screw 9, a vertical screw B10 and a reactor 11.

Fig. 2 is a diagram of a control system, in which the signal forms are:

starting and stopping: passive dry contact signal

Steering switching: passive dry contact signal

And (3) rotating speed control: 4-20 mA analog quantity signal

Run/fault/switch in place: passive dry contact signal

Speed feedback/real-time weighing/current: 4-20 mA analog quantity signal

The programmable logic controller is connected with the human-computer interaction interface and respectively controls the material distribution motor, the conveying belt, the belt scale, the gate valve A, the gate valve B, the reciprocating electric push rod, the vertical screw A, the conveying screw, the vertical screw B and the pyrolysis reactor.

The control system structure mainly comprises the following contents:

1) the human-computer interaction interface adopts an upper computer and communicates with the programmable logic controller through a network protocol to realize data exchange, and the human-computer interaction interface can display parameters of the feeding system in real time and also control equipment of the feeding system in real time;

2) the programmable logic controller is used for acquiring data of a frequency converter and electric drive in the feeding system and controlling the feeding system to operate through output signals;

3) the material distribution motor is driven by the frequency converter, realizes a remote start-stop/rotating speed control function with the programmable logic controller, and receives the running/fault/rotating speed feedback/current signal of the frequency converter;

4) the conveying belt is driven by the frequency converter, realizes a remote start-stop/rotating speed control function with the programmable logic controller, and receives an operation/fault/rotating speed feedback/current signal of the frequency converter;

5) the belt weigher is driven by the belt weigher electrical cabinet, realizes a remote start-stop control function with the programming logic controller, and receives an electrically driven operation/fault/real-time weighing signal;

6) the gate valve A/gate valve B is electrically and directly driven, realizes a remote start-stop/steering switching control function with a programmable logic controller, and receives an electrically driven operation/fault/switch-in-place/current signal;

7) the reciprocating electric push rod is driven by the frequency converter, realizes the functions of starting, stopping, steering switching and rotating speed control with the programmable logic controller, realizes the automatic reciprocating motion of the reciprocating electric push rod through programming, and receives the operation/fault/switch-in-place/rotating speed feedback/current signals of the frequency converter;

8) the vertical spiral A realizes the start-stop function with the programmable logic controller through the electric direct start drive and receives the operation/fault/current signal from the electric direct start drive;

9) the conveying screw is driven by the frequency converter, realizes the start-stop/rotating speed control function with the programmable logic controller, and receives the operation/fault/rotating speed feedback/current signals from the frequency converter;

10) the vertical spiral B realizes the start-stop function with the programmable logic controller through electric direct start drive and receives operation/fault/current signals from the direct start drive;

11) the pyrolysis reactor is driven by the frequency converter, realizes the start-stop/rotating speed control function with the programmable logic controller, and receives the operation/fault/rotating speed feedback/current signal from the frequency converter;

12) the reciprocating type electric push rod pushes and extrudes the garbage to the tail end of the push rod, one path of low-pressure nitrogen continuously enters the tail end of the reciprocating type electric push rod, and the garbage extrusion and the low-pressure nitrogen blowing realize the isolation and sealing in the garbage conveying process.

The normal working logic flow of the linkage control system (as shown in fig. 3) realizes the automatic control flow through the programmable logic controller, the electric drive/frequency converter, the field device and the sensor, and the control method comprises the following steps:

starting the vertical spiral B, judging whether the work is normal, continuing the next step after the work is normal, and checking a fault and restarting the vertical spiral B if the work is not normal;

starting the conveying screw, judging whether the conveying screw works normally, continuing the next step after the conveying screw operates normally, and checking a fault and restarting the conveying screw if the conveying screw does not work normally;

starting the vertical spiral A, judging whether the work is normal, continuing the next step after the work is normal, and checking a fault and restarting the vertical spiral A if the work is not normal;

starting the electric push rod to automatically run in a reciprocating manner, judging whether the electric push rod works normally, continuing the next step after the electric push rod runs normally, and checking a fault and restarting the electric push rod if the electric push rod does not work normally;

judging whether the reciprocating motion of the vertical screw A/B, the conveying screw and the electric push rod works normally or not, continuing the next step after the reciprocating motion is normal, and checking a fault and restarting if the reciprocating motion is not normal;

starting an automatic feeding program, namely closing a gate valve B, and carrying out the next step after the gate valve B is closed in place for 5 seconds;

starting an automatic feeding program, namely opening a gate valve A, and carrying out the next step after the gate valve A is opened to a position for delay of 5 s;

starting an automatic feeding program, namely starting a material distribution motor, a conveying belt and a belt scale at the same time, stopping the material distribution motor, the conveying belt and the belt scale after the three devices all run for T1 seconds (30s), and carrying out the next step after the three devices stop and delay for 5 s;

starting an automatic feeding program, closing a gate valve A, and carrying out the next step after the gate valve A is closed in place for 5 seconds;

starting an automatic feeding program, namely opening a gate valve B, and carrying out the next step after the gate valve B is opened to a position for delay of 5 s;

and starting an automatic feeding program, namely feeding for T2 seconds (corresponding to different garbage feeding amounts in 90-150 seconds), returning to an automatic feeding starting mark, and automatically and circularly feeding.

The linkage control failure safety executes automatic action, and the control method comprises the following steps:

and executing safety action when the following faults occur in the normal execution process, wherein the fault information comprises: the system comprises a material distribution mechanism fault (stop, fault and overcurrent), a conveying belt fault (stop, fault and overcurrent), a belt weighing mechanism fault (stop and fault), a gate valve A fault (open to position, close to position, stop, fault and overcurrent), a gate valve B fault (open to position, close to position, stop, fault and overcurrent), an electric push rod fault (open to position, close to position, stop, fault and overcurrent), a vertical spiral A/B fault (stop, fault and overcurrent), a conveying spiral fault (stop, fault and overcurrent), a reactor fault (stop, fault and overcurrent) and an external parking fault (system parking, external interlocking parking and the like).

The actions are automatically executed in case of failure as follows:

the upper computer HMI carries out sound and information fault alarm prompt;

simultaneously stopping the automatic feeding program;

meanwhile, a stop command is sent out through the programmable logic controller, the output relay is stopped to be disconnected, the passive dry contact signal is changed from being closed to being disconnected, and the material distribution mechanism, the conveying belt, the belt weighing mechanism, the electric push rod, the vertical screw A, the conveying screw and the vertical screw B are stopped;

simultaneously, stopping a motor of the gate valve A after the gate valve A is closed;

and simultaneously stopping the motor of the gate valve B after closing the gate valve B.

A linkage control system of a garbage pyrolysis feeding mechanism is characterized in that a programmable logic controller is connected with a human-computer interaction interface, and the programmable logic controller respectively controls a material distribution motor, a conveying belt, a belt scale, a gate valve A, a gate valve B, a reciprocating electric push rod, a vertical screw A, a conveying screw, a vertical screw B and a pyrolysis reactor.

The human-computer interaction interface adopts an upper computer and communicates with the programmable logic controller through a network protocol to realize data exchange, and the human-computer interaction interface can display parameters of the feeding system in real time and also can control equipment of the feeding system in real time.

The programmable logic controller realizes acquisition of data of a frequency converter and electric drive in the feeding system and can also control the feeding system to operate through output signals; the pyrolysis reactor is driven by a frequency converter, realizes the start-stop/rotating speed control function with a programmable logic controller, and receives the operation/fault/rotating speed feedback/current signal from the frequency converter.

The cloth motor is driven by the frequency converter, realizes a remote start-stop/rotating speed control function with the programmable logic controller, and receives the running/fault/rotating speed feedback/current signal of the frequency converter; the conveying belt is driven by the frequency converter, realizes a remote start-stop/rotating speed control function with the programmable logic controller, and receives the running/fault/rotating speed feedback/current signal of the frequency converter.

The belt weigher is driven by the belt weigher electrical cabinet, realizes a remote start-stop control function with a programmed logic controller, and receives an electrically driven operation/fault/real-time weighing signal.

The gate valve A and the gate valve B are electrically and directly driven to realize a remote start-stop/steering switching control function with a programmable logic controller, and receive an electrically driven operation/fault/switch-in-place/current signal.

The reciprocating electric push rod is driven by the frequency converter, realizes the functions of starting, stopping, steering switching and rotating speed control with the programmable logic controller, realizes the automatic reciprocating motion of the reciprocating electric push rod through programming, and receives the running/fault/switch-in-place/rotating speed feedback/current signals of the frequency converter.

The vertical spiral A and a programmable logic controller realize the start-stop function through the electric direct start drive and receive the operation/fault/current signals from the electric direct start drive; the conveying screw is driven by a frequency converter, realizes a start-stop/rotating speed control function with a programmable logic controller, and receives an operation/fault/rotating speed feedback/current signal from the frequency converter; the vertical spiral B realizes the start-stop function with the programmable logic controller through the electric direct start drive and receives the operation/fault/current signal from the direct start drive.

The control method at the time of failure is as follows:

the man-machine interaction interface carries out sound and information fault alarm prompt;

simultaneously stopping the automatic feeding program;

meanwhile, a stop command is sent out through a programmable logic controller, and the material distribution mechanism, the conveying belt, the belt scale, the reciprocating electric push rod, the vertical screw A, the conveying screw and the vertical screw B are stopped;

simultaneously, stopping a motor of the gate valve A after the gate valve A is closed;

and simultaneously stopping the motor of the gate valve B after closing the gate valve B.

The normal work control method comprises the following steps:

starting the vertical spiral B, judging whether the work is normal, continuing the next step after the work is normal, and checking a fault and restarting the vertical spiral B if the work is not normal;

starting the conveying screw, judging whether the conveying screw works normally, continuing the next step after the conveying screw operates normally, and checking a fault and restarting the conveying screw if the conveying screw does not work normally;

starting the vertical spiral A, judging whether the work is normal, continuing the next step after the work is normal, and checking a fault and restarting the vertical spiral A if the work is not normal;

starting the reciprocating type electric push rod to automatically operate in a reciprocating manner, judging whether the work is normal or not, continuing the next step after the work is normal, and checking a fault and restarting if the work is not normal;

judging whether the reciprocating motion of the vertical screw A, the vertical screw B, the conveying screw and the reciprocating electric push rod works normally or not, continuing the next step after the reciprocating electric push rod works normally, and checking a fault and restarting if the reciprocating electric push rod does not work normally;

starting an automatic feeding program by an automatic feeding starting mark, closing the gate valve B, and carrying out the next step after the gate valve B is closed in place for delay of 5 s;

starting an automatic feeding program, opening a gate valve A, and carrying out the next step after the gate valve A is opened to a position for delay of 5 s;

starting an automatic feeding program, simultaneously starting a material distribution motor, a conveying belt and a belt scale, stopping the material distribution motor, the conveying belt and the belt scale after three devices run for 30s, and performing the next step after the three devices stop and delay for 5 s;

starting an automatic feeding program, closing the gate valve A, and carrying out the next step after the gate valve A is closed in place for 5 seconds;

starting an automatic feeding program, opening a gate valve B, and carrying out the next step after the gate valve B is opened to a position for delay of 5 s;

starting an automatic feeding program, returning an automatic feeding starting mark after the feeding starts to time for 90s, and automatically and circularly feeding.

Claims (10)

1. The utility model provides a garbage pyrolysis feed mechanism's coordinated control system which characterized in that: the programmable logic controller is connected with the human-computer interaction interface and respectively controls the material distribution motor, the conveying belt, the belt scale, the gate valve A, the gate valve B, the reciprocating electric push rod, the vertical screw A, the conveying screw, the vertical screw B and the pyrolysis reactor.

2. The linked control system of the garbage pyrolysis feeding mechanism according to claim 1, characterized in that: the human-computer interaction interface adopts an upper computer and communicates with the programmable logic controller through a network protocol to realize data exchange, and the human-computer interaction interface can display parameters of the feeding system in real time and also can control equipment of the feeding system in real time.

3. The linked control system of the garbage pyrolysis feeding mechanism according to claim 1, characterized in that: the programmable logic controller realizes acquisition of data of a frequency converter and electric drive in the feeding system and can also control the feeding system to operate through output signals; the pyrolysis reactor is driven by a frequency converter, realizes the start-stop/rotating speed control function with a programmable logic controller, and receives the operation/fault/rotating speed feedback/current signal from the frequency converter.

4. The linked control system of the garbage pyrolysis feeding mechanism according to claim 1, characterized in that: the cloth motor is driven by the frequency converter, realizes a remote start-stop/rotating speed control function with the programmable logic controller, and receives the running/fault/rotating speed feedback/current signal of the frequency converter; the conveying belt is driven by the frequency converter, realizes a remote start-stop/rotating speed control function with the programmable logic controller, and receives the running/fault/rotating speed feedback/current signal of the frequency converter.

5. The linked control system of the garbage pyrolysis feeding mechanism according to claim 1, characterized in that: the belt weigher is driven by the belt weigher electrical cabinet, realizes a remote start-stop control function with a programmed logic controller, and receives an electrically driven operation/fault/real-time weighing signal.

6. The linked control system of the garbage pyrolysis feeding mechanism according to claim 1, characterized in that: the gate valve A and the gate valve B are electrically and directly driven to realize a remote start-stop/steering switching control function with a programmable logic controller, and receive an electrically driven operation/fault/switch-in-place/current signal.

7. The linked control system of the garbage pyrolysis feeding mechanism according to claim 1, characterized in that: the reciprocating electric push rod is driven by the frequency converter, realizes the functions of starting, stopping, steering switching and rotating speed control with the programmable logic controller, realizes the automatic reciprocating motion of the reciprocating electric push rod through programming, and receives the running/fault/switch-in-place/rotating speed feedback/current signals of the frequency converter.

8. The linked control system of the garbage pyrolysis feeding mechanism according to claim 1, characterized in that: the vertical spiral A and a programmable logic controller realize the start-stop function through the electric direct start drive and receive the operation/fault/current signals from the electric direct start drive; the conveying screw is driven by a frequency converter, realizes a start-stop/rotating speed control function with a programmable logic controller, and receives an operation/fault/rotating speed feedback/current signal from the frequency converter; the vertical spiral B realizes the start-stop function with the programmable logic controller through the electric direct start drive and receives the operation/fault/current signal from the direct start drive.

9. The linked control system of the garbage pyrolysis feeding mechanism according to claim 1, characterized in that: the control method at the time of failure is as follows:

1) the man-machine interaction interface carries out sound and information fault alarm prompt;

2) simultaneously stopping the automatic feeding program;

3) meanwhile, a stop command is sent out through a programmable logic controller, and the material distribution mechanism, the conveying belt, the belt scale, the reciprocating electric push rod, the vertical screw A, the conveying screw and the vertical screw B are stopped;

4) simultaneously, stopping a motor of the gate valve A after the gate valve A is closed;

5) and simultaneously stopping the motor of the gate valve B after closing the gate valve B.

10. The linked control system of the garbage pyrolysis feeding mechanism according to claim 1, characterized in that: the normal work control method comprises the following steps:

1) starting the vertical spiral B, judging whether the work is normal, continuing the next step after the work is normal, and checking a fault and restarting the vertical spiral B if the work is not normal;

2) starting the conveying screw, judging whether the conveying screw works normally, continuing the next step after the conveying screw operates normally, and checking a fault and restarting the conveying screw if the conveying screw does not work normally;

3) starting the vertical spiral A, judging whether the work is normal, continuing the next step after the work is normal, and checking a fault and restarting the vertical spiral A if the work is not normal;

4) starting the reciprocating type electric push rod to automatically operate in a reciprocating manner, judging whether the work is normal or not, continuing the next step after the work is normal, and checking a fault and restarting if the work is not normal;

5) judging whether the reciprocating motion of the vertical screw A, the vertical screw B, the conveying screw and the reciprocating electric push rod works normally or not, continuing the next step after the reciprocating electric push rod works normally, and checking a fault and restarting if the reciprocating electric push rod does not work normally;

6) starting an automatic feeding program, closing the gate valve B, and carrying out the next step after the gate valve B is closed in place for delay of 5 s;

7) starting an automatic feeding program, opening a gate valve A, and carrying out the next step after the gate valve A is opened to a position for delay of 5 s;

8) starting an automatic feeding program, simultaneously starting a material distribution motor, a conveying belt and a belt scale, stopping the material distribution motor, the conveying belt and the belt scale after three devices run for 30s, and performing the next step after the three devices stop and delay for 5 s;

9) starting an automatic feeding program, closing the gate valve A, and carrying out the next step after the gate valve A is closed in place for 5 seconds;

10) starting an automatic feeding program, opening a gate valve B, and carrying out the next step after the gate valve B is opened to a position for delay of 5 s;

11) starting an automatic feeding program, and returning to the step 6) to circularly execute the automatic feeding program after the feeding starts to time for 90 s;

12) the reciprocating type electric push rod pushes and extrudes the garbage to the tail end of the push rod, one path of low-pressure nitrogen continuously enters the tail end of the reciprocating type electric push rod, and the garbage extrusion and the low-pressure nitrogen blowing realize the isolation and sealing in the garbage conveying process.

Images